Abstract:
A reflector for EUV radiation, the reflector comprising a reflector substrate and a reflective surface, the reflector substrate having a plurality of coolant channels formed therein, the coolant channels being substantially straight, substantially parallel to each other and substantially parallel to the reflective surface and configured so that coolant flows in parallel through the coolant channels and in contact with the reflector substrate.
Abstract:
Die Erfindung betrifft ein reflektives optisches Element, insbesondere für eine mikrolithographische Projektionsbelichtungsanlage oder eine Maskeninspektionsanlage. Gemäß einem Aspekt der Erfindung weist das refiektive optische Element eine optische Wirkfläche, ein Substrat (405, 505), ein Reflexionsschichtsystem (410, 510) und wenigstens eine poröse Ausgasschicht (450, 550) auf, welche bei Bestrahlung der optischen Wirkfläche (400a, 500a) mit elektromagnetischer Strahlung zumindest zeitweise in der Ausgasschicht (450, 550) adsorbierte Teilchen freisetzt.
Abstract:
A photo-mask for use in extreme ultraviolet (EUV) lithography, in which the photo-mask has low coefficient of thermal expansion and high specific stiffness.
Abstract:
A glass article for use in Extreme Ultra Violet Lithography (EUVL) is provided. The glass article includes a silica-titania glass having a compositional gradient through the glass article, the compositional gradient being defined by the functions: [TiO 2 ] = (c + f(x,y,z)), and [SiO 2 ] = (100 - {c + f(x,y,z)} - δ(x,y,z) ) wherein [TiO 2 ] is the concentration of titania in wt.%, [SiO 2 ] is the concentration of silica in wt.%, c is the titania concentration in wt.% for a predetermined zero crossover temperature (T zc ), f(x,y,z) is a function in three-dimensional space that defines the difference in average composition of a volume element centered at the coordinates (x,y,z) with respect to c, and δ(x,y,z) is a function in three-dimensional space that defines the sum of all other components of a volume element centered at the coordinates (x,y,z).
Abstract:
A technique for inspecting, qualifying and repairing photo-masks for use at extreme ultra-violet ( EUV ) wavelengths is described. In this technique, multiple images of a substrate and/or a blank that includes multiple layers deposited on the substrate are measured and compared to identify first potential defects. Using information associated with the first potential defects, such as locations of the first potential defects, another image of the EUV photo-mask that includes a mask pattern defined in an absorption layer, which is deposited on top of the multiple layers, is measured. Based on the other image and the first potential defects, second potential defects in the EUV photo-mask are identified. Next, a qualification condition of the EUV photo-mask is determined based on the first potential defects and the second potential defects.